Final answer:
The scale factor between two circles is the ratio of their radii. If one circle is a scaled copy of another, then the scale factor is the radius of the smaller circle divided by the radius of the larger circle.
Step-by-step explanation:
To determine the scale factor of two circles where one is a scaled copy of the other, you would compare the radii of the two circles. If the circle centered at q is a scaled copy of the circle centered at r, then the scale factor is the ratio of the radius of the circle centered at q to the radius of the circle centered at r (radius of q / radius of r). For example, if the radius of circle q is 5 and the radius of circle r is 10, the scale factor is 0.5. This is because the circle q has a radius that is half the size of circle r's radius.
In the context provided, if we're given that one value is a scaled copy of another, such as Q2 = 0.5Q1, it implies that the scale factor would be the fraction mentioned, which is 0.5 in this case. Applying this to the circle scenario, if we had similar information about the radii, we could easily determine the scale factor.